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CouchRequest.cs
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CouchRequest.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Net;
using System.Text;
using System.Web;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
namespace Divan
{
/// <summary>
/// A CouchDB HTTP request with all its options. This is where we do the actual HTTP requests to CouchDB.
/// </summary>
public class CouchRequest
{
private const int UploadBufferSize = 100000;
private readonly CouchDatabase db;
private Stream postStream;
private readonly CouchServer server;
private string etag, etagToCheck;
public Dictionary<string, string> headers = new Dictionary<string, string>();
// Query options
public string method = "GET"; // PUT, DELETE, POST, HEAD
public string mimeType;
public string path;
public string query;
public JToken result;
public CouchRequest(CouchServer server)
{
this.server = server;
}
public CouchRequest(CouchDatabase db)
{
server = db.Server;
this.db = db;
}
public CouchRequest Etag(string value)
{
etagToCheck = value;
headers["If-Modified"] = value;
return this;
}
public CouchRequest Path(string name)
{
path = name;
return this;
}
public CouchRequest Query(string name)
{
query = name;
return this;
}
public CouchRequest QueryOptions(ICollection<KeyValuePair<string, string>> options)
{
if (options == null || options.Count == 0)
{
return this;
}
var sb = new StringBuilder();
sb.Append("?");
foreach (var q in options)
{
if (sb.Length > 1)
{
sb.Append("&");
}
sb.Append(HttpUtility.UrlEncode(q.Key));
sb.Append("=");
sb.Append(HttpUtility.UrlEncode(q.Value));
}
return Query(sb.ToString());
}
/// <summary>
/// Turn the request into a HEAD request, HEAD requests are problematic
/// under Mono 2.4, but has been fixed in later releases.
/// </summary>
public CouchRequest Head()
{
// NOTE: We need to do this until next release of mono where HEAD requests have been fixed!
method = server.RunningOnMono ? "GET" : "HEAD";
return this;
}
public CouchRequest Copy()
{
method = "COPY";
return this;
}
public CouchRequest PostJson()
{
MimeTypeJson();
return Post();
}
public CouchRequest Post()
{
method = "POST";
return this;
}
public CouchRequest Get()
{
method = "GET";
return this;
}
public CouchRequest Put()
{
method = "PUT";
return this;
}
public CouchRequest Delete()
{
method = "DELETE";
return this;
}
public CouchRequest Data(string data)
{
return Data(Encoding.UTF8.GetBytes(data));
}
public CouchRequest Data(byte[] data)
{
postStream = new MemoryStream(data);
return this;
}
public CouchRequest Data(Stream dataStream)
{
postStream = dataStream;
return this;
}
public CouchRequest MimeType(string type)
{
mimeType = type;
return this;
}
public CouchRequest MimeTypeJson()
{
MimeType("application/json");
return this;
}
public JObject Result()
{
return (JObject)result;
}
public T Result<T>() where T : JToken
{
return (T)result;
}
public string Etag()
{
return etag;
}
public CouchRequest Check(string message)
{
try
{
if (result == null)
{
Parse();
}
if (!result["ok"].Value<bool>())
{
throw CouchException.Create(string.Format(CultureInfo.InvariantCulture, message + ": {0}", result));
}
return this;
}
catch (WebException e)
{
throw CouchException.Create(message, e);
}
}
private HttpWebRequest GetRequest()
{
var requestUri = new UriBuilder("http", server.Host, server.Port, ((db != null) ? db.Name + "/" : "") + path, query).Uri;
var request = WebRequest.Create(requestUri) as HttpWebRequest;
if (request == null)
{
throw CouchException.Create("Failed to create request");
}
request.Timeout = 3600000; // 1 hour. May use System.Threading.Timeout.Infinite;
request.Method = method;
if (mimeType != null)
{
request.ContentType = mimeType;
}
foreach (var header in headers)
{
request.Headers.Add(header.Key, header.Value);
}
if (!string.IsNullOrEmpty(server.EncodedCredentials))
{
request.Headers.Add("Authorization", server.EncodedCredentials);
}
if (postStream != null)
{
WriteData(request);
}
Trace.WriteLine(string.Format(CultureInfo.InvariantCulture, "Request: {0} Method: {1}", requestUri, method));
return request;
}
private void WriteData(HttpWebRequest request)
{
request.ContentLength = postStream.Length;
using (Stream ps = request.GetRequestStream())
{
var buffer = new byte[UploadBufferSize];
int bytesRead;
while ((bytesRead = postStream.Read(buffer, 0, buffer.Length)) != 0)
{
ps.Write(buffer, 0, bytesRead);
}
}
}
public JObject Parse()
{
return Parse<JObject>();
}
public T Parse<T>() where T : JToken
{
//var timer = new Stopwatch();
//timer.Start();
using (WebResponse response = GetResponse())
{
using (Stream stream = response.GetResponseStream())
{
using (var reader = new StreamReader(stream))
{
using (var textReader = new JsonTextReader(reader))
{
PickETag(response);
if (etagToCheck != null)
{
if (IsETagValid())
{
return null;
}
}
result = JToken.ReadFrom(textReader); // We know it is a top level JSON JObject.
}
}
}
}
//timer.Stop();
//Trace.WriteLine("Time for Couch HTTP & JSON PARSE: " + timer.ElapsedMilliseconds);
return (T)result;
}
/// <summary>
/// Returns a Json stream from the server
/// </summary>
/// <returns></returns>
public JsonTextReader Stream()
{
return new JsonTextReader(new StreamReader(GetResponse().GetResponseStream()));
}
private void PickETag(WebResponse response)
{
etag = response.Headers["ETag"];
if (etag != null)
{
etag = etag.EndsWith("\"") ? etag.Substring(1, etag.Length - 2) : etag;
}
}
/// <summary>
/// Return the request as a plain string instead of trying to parse it.
/// </summary>
public string String()
{
using (WebResponse response = GetResponse())
{
using (var reader = new StreamReader(response.GetResponseStream()))
{
PickETag(response);
if (etagToCheck != null)
{
if (IsETagValid())
{
return null;
}
}
return reader.ReadToEnd();
}
}
}
public WebResponse Response()
{
WebResponse response = GetResponse();
PickETag(response);
if (etagToCheck != null)
{
if (IsETagValid())
{
return null;
}
}
return response;
}
private WebResponse GetResponse()
{
return GetRequest().GetResponse();
}
public CouchRequest Send()
{
using (WebResponse response = GetResponse())
{
PickETag(response);
return this;
}
}
public bool IsETagValid()
{
return etagToCheck == etag;
}
public CouchRequest AddHeader(string key, string value)
{
headers[key] = value;
return this;
}
}
}